Add extra list item (<li></li>) elements to the Confirmation and Invoice pages. Passes the MemberOrder attached to that invoice.

do_action("pmpro_invoice_bullets_top", MemberOrder $pmpro_invoice);

Parameters

Source

File: https://github.com/strangerstudios/paid-memberships-pro/blob/master/pages/checkout.php

File: https://github.com/strangerstudios/paid-memberships-pro/blob/master/pages/invoice.php